JPS6150770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device, and more specifically,
The present invention relates to a welding device used to weld and join synthetic resin molded products into a finished molded product.

It has been conventional practice to obtain products by welding multiple synthetic resin molded products (hereinafter simply referred to as molded products), such as molded products by injection molding or extrusion molding, to each other, and various methods are used depending on the product. Structure welding equipment is used.

The structure of such a conventional welding device includes a pair of holding devices that are arranged vertically facing each other to accommodate and hold the objects to be welded and welded, and that can be approached and separated from each other. and a heating plate provided so as to be able to move in and out through the gaps when the respective holding devices are separated, and the object to be welded held by the pair of holding devices vertically facing each other is pressed by the approach of the holding devices. It was equipped with a press plate for joining and a holding frame for holding the objects to be welded on the press plate.

By the way, it is known that molded products that are welded and joined to each other by a welding device shrink in a predetermined curve over time after being molded. Therefore, such molded products are usually molded using a suitable mold in order to obtain dimensions slightly larger than the designed dimensions of the finished product. After a predetermined period of time has passed after molding, each of these molded products is molded into a mold in order to accurately align the two molded products and to achieve the designed finished product dimensions assuming the existence of shrinkage errors in each molded product. They are aligned and welded together while correcting their dimensions with a frame. In particular, when the completed welded product is like a pallet, accurate alignment of the upper and lower halves of the molded product is important due to the large size of the molded product itself and the welding surface. Warpage or shrinkage differences between molded products, which occur noticeably due to narrowing, cause the position of the joint surface to shift,
As a result, this is considered to be particularly important because it causes a decrease in the strength of the welded part.

A formwork used for such a purpose is used in the welding device to form an internal shape that is substantially the same as the external shape of the object to be welded (molded product) but slightly smaller in size (designed dimensions of the finished product). A fixed holding frame was provided on the opposing surfaces of each press plate.
However, the conventional holding device including the fixed holding frame and the pressing plate has the problem of being uneconomical because it can only hold and correct molded products such as pallets of one size.

Therefore, the object of the present invention is to weld two objects by
It is a welding device that aligns and welds the dimensions of molded products to each other, and each of its component parts, a pair of holding devices that can be approached at a distance from each other, is capable of holding and correcting molded products of all kinds of sizes. The object of the present invention is to provide a welding device that enables the following.

To summarize the welding device of the present invention, the device includes:
A pair of holding devices that are arranged vertically facing each other to accommodate, hold and weld the objects to be welded and welded, and that can be approached and separated from each other, and a pair of holding devices that move in and out of the gap when the respective holding devices are separated. A welding device comprising a heating plate which can be provided, wherein each holding device comprises a pressing plate and a holding frame provided on the opposing surface of the pressing plate, and each holding frame is provided with a heating plate. a fixed frame member disposed on the pressing plate that contacts two adjacent sides of the welded object to regulate the movement of the welded object in order to position the welded object at a predetermined position on the pressing plate; a movable frame member movably disposed with respect to the pressing plate to press the welded object against the fixed frame member from opposite sides of the two sides of the welded object to hold and correct the dimensions; and a device for moving the frame member.

Hereinafter, the welding apparatus of the present invention will be explained in more detail with reference to preferred embodiments shown in the accompanying drawings. Note that this embodiment shows a welding device used to form a pallet as an example of a synthetic resin molded product (finished product), and therefore, in the following description, the synthetic resin molded product will be simply referred to as a pallet.

In FIG. 1, a welding apparatus according to the present invention is generally designated by the reference numeral 10. This welding device 10 includes a pair of holding devices 11a and 11b that are vertically spaced apart and arranged facing each other, and a heating plate (not shown) that is provided so as to be movable in and out of this space.
Since this heating plate is well known in this type of welding apparatus 10, detailed explanation thereof will be omitted.

Each of the holding devices 11a, 11b includes a press plate 12a, 12b, and a holding frame 13a, 13b provided on the press plate. This holding frame 1
3a and 13b are completely the same in structure, and to explain one of them with reference to FIG. Board 12a
In order to position the molded product at a predetermined position above, fixed frame members 14a and 14b are provided that abut on two adjacent sides of the molded product and regulate the movement of the molded product.

The fixed frame members 14a, 14b have an L-shaped cross section, and are arranged with their flange portions 15a, 15b, which are in close contact with the press plate 12a, facing toward the outer edge of the press plate. A plurality of slots 16 are provided in each flange portion of each fixed frame member 14a, 14b, and each fixed frame member 14a is tightened by tightening bolts 17 that are screwed into the press plate 12a through the slots. , 14b are fixed to the pressing plate 12a. However, even when it is fixed, it means that it is immovable with respect to the press plate 12a when positioning the molded product, and when the fixed frame members 14a and 14b are attached to the press plate 12a mentioned above. Relative angle, e.g. both fixed frame members 14
Said slot 16 allows its position to be moved slightly so that a, 14b can be adjusted to be exactly orthogonal. Note that the means for fixing and adjusting the fixed frame members 14a, 14b to the press plate 12a is not limited to the slots 16 and bolts 17 as described above;
Various methods can be used, such as connecting a threaded rod to the press plate 12a and threading the rod through a fixing nut erected on the press plate 12a.

In the embodiment shown in FIG. 2, these fixed frame members 14a and 14b are each separate members,
Therefore, when attaching to the press plate 12, it may be necessary to adjust the relative angle as described above, but the third
As shown in the figure, these two fixed frame members 14a,
14b may be fixedly connected or integrated at a predetermined relative angle.

The holding frame 13a having such fixed frame members 14a and 14b further includes a movable frame member 18,
As is clear from FIG. 2, the movable frame member 18 is positioned opposite the corner formed by the fixed frame members so as to cooperate with the fixed frame members 14a and 14b to define a rectangular area. When viewed from above, they are arranged as a key-shaped unit. That is, the movable frame member 18 has the same cross-sectional shape as the fixed frame member, and the corner portion 19 of the movable frame member 18 is an imaginary member that matches the diagonal of the molded product 23a that is positioned by contacting the fixed frame member on two sides. The tip of a piston rod 22 of a hydraulic piston device 21 fixed on the press plate 12a is connected to the flange portion 30 on the outside of the corner portion 19.

This piston rod 22 coincides with the imaginary line 20 and extends in the same direction. As a result, the movable frame member 18 is actuated by the hydraulic piston device 21.
moves its corner 19 in parallel along the imaginary line 20, and as a result, a large number of similar rectangular areas can be partitioned using the fixed frame members 14a and 14b as common sides. This means that the fixed frame members 14a,
14b, the molded product 23a positioned with two adjacent sides in contact with each other is pressed by the movable frame member 18 from the opposite corner side of the molded product on the other two sides to correct its dimensions. It means.

The movable frame member 18 is formed on a pressing plate and extends in that direction in order to accurately move in parallel along the aforementioned direction and maintain its posture with respect to the movement path. It is slidably attached to two rails 24a, 24b spaced apart. The configuration of this rail will be explained when other embodiments are explained.

FIG. 3 shows the holding frame 1 in the welding device of the present invention.
An alternative embodiment of 3a is shown. In the holding frame 13a of this embodiment, the fixed frame members 14a, 14
b is an example in which they are fixedly connected, that is, integrated, with a predetermined relative angle (90°). Holding frame 1 of this example
3a, the movable frame member that presses two adjacent sides of the molded product against the fixed frame members 14a, 14b is composed of separate first and second movable frame members 18a, 18b for each side. , each has its own dedicated rail 25 so that it can move independently.
a, 25b and 26a, 26b and hydraulic piston devices 27a, 27b so as to be slidable on the pressing plate 12a. Of course, these rails and the like are arranged so that each movable frame member 18a, 18b can move while facing the opposing fixed frame member 14a, 14b in parallel.

According to the holding frame 13a of such an embodiment, it is not limited to the size of similar molded products as in the embodiment shown in FIG. It can be easily tightened and joined.

FIG. 4 shows yet another embodiment of the holding frame 13a. This embodiment is basically the same in configuration as the embodiment shown in FIG. It consists of short sections that partially press against its two sides, and therefore there is only one rail movably supporting these sections.

FIG. 5a shows a mounting structure for the movable frame member and the rail based on the configuration of the embodiment shown in FIG. 4. That is, a recess 28 having a rectangular cross section is formed on the surface of the pressing plate 12a and extends in the rail installation direction, and presser plates 29a and 29b are arranged at both side edges of the recess 28 and bolted thereto.
Opposite sides of the presser plates 29a and 29b have recesses 28.
is formed into an inclined surface so as to leave a trapezoidal cross-sectional interval at the center of the cross-section, and the trapezoidal cross-sectional interval, that is, the trapezoidal groove is formed in the groove shape formed on the lower surface of the flange portion 30 of the movable frame member 18a. Matching protrusions 31 are fitted.

Figures 5b and 5c show other modified examples of the mounting structure for the movable frame member and the tray, and as is clear from the figures, these modified examples each include the aforementioned groove and a protrusion that fits into the groove. The only difference is the shape of each part.

To explain the operation of the pair of upper and lower holding frames 13a and 13b in the welding device 10 of the present invention as described above, referring to FIGS. 1
Molded products 23a and 23b of the upper and lower halves, which are constituent members of the pallet, are placed one on top of the other in an unwelded state on the press plate 12a of 1b. Next, the upper and lower holding devices 11a and 1b are brought close to each other by hydraulic piston devices 32a and 32b, respectively, and the lower molded product 23a is brought into close contact with the pressing plate 12a, and the upper molded product 23b is brought into close contact with the pressing plate 12b. The movable frame member 1 of each holding frame 13a, 13b
8 is moved by the hydraulic piston device 21 to fix each molded product 23a, 23b to the fixed frame members 14a, 14b.
press against.

As a result, each molded product 23a, 23 has an external dimension that is not necessarily constant due to shrinkage error after molding.
b is adjusted to predetermined dimensions in both the vertical and horizontal directions. FIG. 6 is a schematic diagram of this normal state seen from one side of the molded product. For example, if the predetermined width dimension is W, the upper molded product 23b is compressed by a ₁ when pushed from the direction of the arrow. The lower molded product 23a is similarly pushed in the direction of the arrow and compressed by a ₂ . As a result, the upper and lower molded products 23a, 23b are corrected to a predetermined position and to a predetermined size, and perfect alignment is ensured when the two are welded together thereafter.

The amount of movement of the movable frame member is determined by the hydraulic piston device 2 based on the design dimensions of the pallet to be formed.
1 stroke by suitable means.

As described above, according to the welding apparatus of the present invention, it is possible to hold, correct, and weld and join molded products such as many types of pallets with different sizes using one welding apparatus. Furthermore, compared to a conventional welding device using a four-sided fixed holding frame, there is no need to push the molded product into the holding frame, so there is no possibility of damage to the side walls of the molded product. As a result, synthetic resin molded articles, such as pallets, formed by welding and bonding can be produced extremely economically.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the welding device of the present invention, FIG. 2 is a plan view showing one holding device in the welding device, and FIGS. 3 and 4 are other embodiments of the holding device. FIG. 5a is a plan view similar to FIG. 2 showing examples, FIG. 5a is a sectional view taken along line a-a in FIG. FIG. 6c is a sectional view similar to FIG. 5a showing another modification of the mounting structure for the movable frame member and the rail, and FIG. 6 is a schematic view showing the molded product in a dimensionally correct state. 10... Welding device, 11a, 11b... Holding device, 12a, 12b... Press plate, 13... Holding frame, 14a, 14b... Fixed frame member, 18, 18
a, 18b...Movable frame member, 21, 27a, 27
b...Hydraulic piston device, 23a, 23b...Molded parts of upper and lower halves.

Claims (1)

[Claims] 1 A pair of holding devices that are arranged vertically facing each other to accommodate and hold the objects to be welded and welded, and that can be approached and separated from each other, and when the respective holding devices are separated, the gap is In the welding device, each of the holding devices includes a pressing plate and a holding frame provided on opposing surfaces of the pressing plates, and each of the holding frames includes a heating plate that can be moved in and out. a fixed frame member disposed on the press plate that contacts two adjacent sides of the weld object to regulate the movement of the weld object in order to position the weld object at a predetermined position on the press plate; a movable frame member movably disposed relative to the pressing plate to press the welded object against the fixed frame member from opposite sides of the two sides of the welded object to hold and dimensionally correct the welded object; and a device for moving a movable frame member.